MAX5491LB01000-T [MAXIM]
Precision-Matched Resistor-Divider in SOT23; 精密匹配的电阻分压器，SOT23封装
| 型号： | MAX5491LB01000-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Precision-Matched Resistor-Divider in SOT23 |
| 文件： | 总7页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3009; Rev 3; 12/04
Precision-Matched Resistor-Divider in SOT23
General Description
Features
The MAX5491 precision resistor-divider consists of two
accurately matched resistors with access to the ends
and center of the divider. This device offers excellent
resistance matching of 0.035% (A grade), 0.05% (B
grade), and 0.1% (C grade). The MAX5491 includes an
extremely low resistance-ratio temperature drift of
2ppm/°C over -40°C to +85°C, and has an end-to-end
resistance of 30kΩ. Resistance ratios from 1:1 to 30:1 are
available. Ten standard ratios are available (see Table
1), and custom ratios are also available upon request. To
enhance device and system robustness, the MAX5491
also features 2kꢀ ꢁuman Body Model electrostatic dis-
charge (ESD) protection to ensure against real-world
ESD events. The MAX5491 is ideal for precision gain-set-
ting applications where tight resistance matching and
low temperature drift are necessary.
♦ Resistance Ratios from 1:1 to 30:1
♦ Custom Ratios Available Upon Request
♦ ±±2k ꢀuman ꢁoꢂd ꢃoꢂel ꢄES ꢅrotection
♦ Tight Initial Ratio Accuracd
0.035% (ꢃAX5491A)
0.05% (ꢃAX5491ꢁ)
0.1% (ꢃAX5491C)
♦ Low ±ppm/°C Resistor-Ratio-Srift
♦ Up to 50k Operating koltage Across Eum of R1
anꢂ R±
♦ Tind 3-ꢅin EOT±3 ꢅac2age
The MAX5491 is available in a space-saving 3-pin
SOT23 package, and is guaranteed over the extended
-40°C to +85°C temperature range.
Ordering Information*
Applications
Industrial Process Control
Instrumentation
RATIO
ACCURACY
(%)
Tꢄꢃꢅ
RANGꢄ
ꢅIN-
ꢅACKAGꢄ
ꢅART
Precision Gain Setting
Medical Equipment
Automatic Test Equipment
Base Stations
0.035
0.05
0.1
MAX5491_A_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3
MAX5491_B_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3
MAX5491_C_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3
*See the How to Order section for more details.
Block Diagram
Pin Configuration
TOP VIEW
P1
MAX5491
P1
P2
1
2
R
1
3
P3
MAX5491
P3
R
2
P2
EOT±3
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Precision-Matched Resistor-Divider in SOT23
AꢁEOLUTꢄ ꢃAXIꢃUꢃ RATINGE
ꢀoltage Between P1 and P2...................................................50ꢀ
Continuous Current into Any Pin.................................... 1.ꢂ5mA
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Continuous Power Dissipation (T = +ꢂ0°C)
A
3-Pin SOT23 (derate ꢂ.1mW/°C above +ꢂ0°C).........5ꢂ1.4mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
SC ꢄLꢄCTRICAL CꢀARACTꢄRIETICE
(T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
A
ꢅARAꢃꢄTꢄR
EYꢃꢁOL
CONSITIONE
ꢃIN
TYꢅ
ꢃAX
0.035
0.05
0.1
UNITE
MAX5491_A, T = +25°C
A
Initial Resistor Ratio Error (Note 2)
%
MAX5491_B, T = +25°C
A
MAX5491_C, T = +25°C
A
1:1 ≤ ratio ≤ 3.2:1
3.2:1 < ratio ≤ 10:1
10:1 < ratio ≤ 30:1
2
4
Resistance-Ratio Temperature
Coefficient (Note 3)
ppm/°C
ppm/°C
5.5
Absolute Temperature Coefficient
of Resistance
TCR
ꢀCR
(Note 4)
(Note 5)
35
ꢀoltage Coefficient of Resistance
0.1
30
ppm/ꢀ
kΩ
End-to-End Resistance (R + R )
28.5
0
31.5
1.ꢂ5
1
2
Continuous Current
I
, I
R1 R2
mA
Continuous Working ꢀoltage
Between P1 and P2
ꢀ
50
ꢀ
P1-P2
Power Rating
8ꢂ.5
mW
pF
Pin Capacitance
2
Resistance Ratio Long-Term
Stability
2000hr at +ꢂ0°C
0.03
%
Note 1: The MAX5491 is 100% production tested at T = +25°C. Specifications over -40°C to +85°C are guaranteed by design.
A
Note ±: Testing conditions: T = +25°C, ꢀ
= 9ꢀ and 50ꢀ.
P1-P2
A
⎛
⎞
R
1
∆
⎜
⎝
⎟
⎠
Note 3: Resistance-ratio temperature coefficient is defined as
R
2
R
R
1
2
× ∆T
∆ R + R
(
)
Note 4: Absolute TCR is defined as
1
2
and is tested at 9ꢀ and 50ꢀ.
R + R × ∆T
(
)
1
2
⎛
⎞
R
1
∆
⎜
⎟
⎠
Note 5: Resistance-ratio voltage coefficient is defined as
R
⎝
2
R
1
× ∆ꢀ
R
2
±
_______________________________________________________________________________________
Precision-Matched Resistor-Divider in SOT23
Typical Operating Characteristics
(ꢀ
P1-P2
= 10ꢀ, T = +25°C, unless otherwise noted.)
A
NORMALIZED RESISTOR-RATIO DRIFT
NORMALIZED RESISTOR-RATIO DRIFT
vs. TEMPERATURE
vs. TEMPERATURE
400
400
300
200
100
0
V
P1-P2
= 10V
V
= 10V
P1-P2
300
200
100
0
RATIO = 5:1
RATIO = 1:1
-100
-200
-300
-400
-100
-200
-300
-400
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Pin Description
ꢅIN
NAꢃꢄ
P1
FUNCTION
1
2
3
R Connection Terminal
1
P2
R Connection Terminal
2
P3
Midpoint Between R and R Connection Terminals
1 2
resistance ratios (R /R ) from 1:1 to 30:1 and is ideally
1
2
Detailed Description
suited for precision operational amplifier gain/attenua-
tion control. The MAX5491 features a 2kꢀ ESD protec-
tion that enhances system robustness. A maximum
initial ratio accuracy of 0.035% and a low 2ppm/°C ratio
drift enhance system accuracy.
As shown in the Block Diagram, the MAX5491 consists
of two precision, low-ratio-drift resistors with an end-to-
end resistance of 30kΩ (R + R ). P3 is the center tap
1
2
of the divider. The maximum working voltage of the
MAX5491 is 50ꢀ. This device offers a wide range of
_______________________________________________________________________________________
3
Precision-Matched Resistor-Divider in SOT23
Typical Applications
ꢀ
ꢀ
R
1
ꢀ
ꢀ
R
1
OUT
OUT
A
=
= −
A
=
= 1 +
R
R
IN
2
IN
2
IN
OUT
OUT
P3
P3
MAX5491
MAX5491
P1
P2
P1
P2
IN
R
2
R
1
R
2
R
1
Figure 1. Inverting Amplifier Configuration
Figure 2. Noninverting Amplifier Configuration
IN
ꢀ
ꢀ
R
2
R + R
ꢀ
ꢀ
R
2
+ R
OUT
OUT
A
=
=
A
=
=
IN
P1
R
IN
1
2
IN
1
2
MAX5491
P1
R
R
1
MAX5491
P3
R
1
P3
OUT
OUT
2
R
2
P2
P2
Figure 3. Buffered Attenuator
Figure 4. Attenuator with Buffer
The thermal resistance from junction to ambient, θ
,
J-A
Applications Information
for a 3-pin SOT23 package is 141°C/W. Calculate the
resulting temperature rise as:
Self-Heating and Error
Applying a voltage across terminals P1 and P2 causes
the device to heat up due to power dissipation. In high-
voltage applications, consider the error in resistance-
ratio temperature coefficient caused by self-heating.
The worst-case self-heating occurs when the operating
voltage attains its maximum value. Approximate the
result of power dissipation under this condition as:
∆T = 83.3mW x 141°C/W = 11.ꢂ°C
If the ratio temperature coefficient is 2ppm/°C (typ), the
total error introduced by self-heating is:
11.ꢂ°C x 2ppm/°C = 23.4ppm
2
2
ꢀ
50ꢀ
(
)
(
)
MAX
P
=
=
= 83.3mW
DISS
R
30kΩ
4
_______________________________________________________________________________________
Precision-Matched Resistor-Divider in SOT23
How to Order
ꢅRꢄFIX
ꢃAX
5491
k
A
10000
-T
ROOT ꢅART NUꢃꢁꢄR
MAX5491 = 30kΩ End-to-End
RATIO RANGꢄ
L through W. Resistor ratio must fall in the appropriate
ratio range. (Eee Table ±.)
RATIO ACCURACY
A = 0.035% (max); B = 0.05% (max); C = 0.1% (max)
RꢄEIETANCꢄ RATIO
Five number ratio designator. Ratios available from 1:1 to 30:1.
Format examples:
010000 = 1:1
02500 = 2.5:1
0ꢂ538 = ꢂ.538:1
25000 = 25:1
TAꢅꢄ ANS RꢄꢄL
ꢄxample ꢅart Numbers
RꢄEIETOR-RATIO
ACCURACY (% ꢃAX)
ꢅART
RꢄEIETOR-RATIO RANGꢄ
RꢄEIETOR RATIO
MAX5491RA02500-T
MAX5491ꢀC10000-T
MAX5491SB03200-T
MAX5491UA0ꢂ538-T
2.000 to 2.899
10.000 to 15.999
2.900 to 3.999
6.000 to 9.999
0.035
0.100
0.050
0.035
2.5:1
10:1
3.2:1
ꢂ.538:1
Table 1. Etanꢂarꢂ Ratios*
RꢄEIETOR-RATIO
RꢄEIETOR-RATIO
ACCURACY (% ꢃAX)
ꢅART
RꢄEIETOR RATIO
TOꢅ ꢃARK
EUFFIX
MAX5491LA01000-T
MAX5491LB01000-T
MAX5491LC01000-T
MAX5491MA01100-T
MAX5491MB01100-T
MAX5491MC01100-T
MAX5491NA01500-T
MAX5491NB01500-T
MAX5491NC01500-T
MAX5491PA02000-T
MAX5491PB02000-T
MAX5491PC02000-T
MAX5491RA02500-T
1:1
1:1
01000
01000
01000
01100
01100
01100
01500
01500
01500
02000
02000
02000
02500
0.035
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
0.035
FZPD
FZPE
FZPF
FZPA
FZPB
FZPC
FZOX
FZOY
FZOZ
FZOO
FZOP
FZOQ
FZPP
1:1
1.1:1
1.1:1
1.1:1
1.5:1
1.5:1
1.5:1
2:1
2:1
2:1
2.5:1
_______________________________________________________________________________________
5
Precision-Matched Resistor-Divider in SOT23
Table 1. Etanꢂarꢂ Ratios* (continueꢂ)
RꢄEIETOR-RATIO
EUFFIX
RꢄEIETOR-RATIO
ACCURACY (% ꢃAX)
ꢅART
RꢄEIETOR RATIO
TOꢅ ꢃARK
MAX5491RB02500-T
MAX5491RC02500-T
MAX5491SA03200-T
MAX5491SB03200-T
MAX5491SC03200-T
MAX5491TA05000-T
MAX5491TB05000-T
MAX5491TC05000-T
MAX5491UA0ꢂ538-T
MAX5491UB0ꢂ538-T
MAX5491UC0ꢂ538-T
MAX5491ꢀA10000-T
MAX5491ꢀB10000-T
MAX5491ꢀC10000-T
MAX5491WA30000-T
MAX5491WB30000-T
MAX5491WC30000-T
2.5:1
2.5:1
3.2:1
3.2:1
3.2:1
5:1
02500
02500
03200
03200
03200
05000
05000
05000
0ꢂ538
0ꢂ538
0ꢂ538
10000
10000
10000
30000
30000
30000
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
0.035
0.050
0.100
FZPQ
FZON
FZOU
FZOꢀ
FZOW
FZOR
FZOS
FZOT
FZPM
FZPN
FZPO
FZPJ
5:1
5:1
ꢂ.538:1
ꢂ.538:1
ꢂ.538:1
10:1
10:1
FZPK
FZPL
FZPG
FZPꢁ
FZPI
10:1
30:1
30:1
30:1
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values between 1:1 to 30:1.
A minimum order quantity of 10,000 units is required for nonstandard ratios. Please contact factory for more information.
Table ±. Ratio Ranges
Chip Information
LꢄTTꢄR EUFFIX
RꢄEIETOR-RATIO RANGꢄ
1.000 to 1.099
TRANSISTOR COUNT: 0
PROCESS: BiCMOS
L
M
N
P
1.100 to 1.349
1.350 to 1.699
1.ꢂ00 to 2.000
R
S
2.001 to 2.899
2.900 to 3.999
T
4.000 to 5.999
U
ꢀ
6.000 to 9.999
10.000 to 15.999
16.000 to 30.000
W
6
_______________________________________________________________________________________
Precision-Matched Resistor-Divider in SOT23
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/pac2ages.)
PACKAGE OUTLINE, 3L SOT-23
1
21-0051
F
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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